Snapshots are something you control - they don't happen by themselves. Furthermore, you only "pay" their storage cost for data which actually changes. On a 2TB

Snapshots are something you control - they don't happen by themselves. Furthermore, you only "pay" their storage cost for data which actually changes. On a 2TB volume, last snapshotted 1 week ago, if only 5GB have changed since then, that's the only storage overhead (ignoring for simplicity the folder structure itself). Also, if a single data block changes 20 times since its last snapshot, you still only "pay" storage costs for its current version + the one sitting in the last snapshot.